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path: root/fe/src/App.svelte
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<script lang="ts">
    import {onMount} from 'svelte';
    import svelteLogo from './assets/svelte.svg'
    import viteLogo from '/vite.svg'
    import Counter from './lib/Counter.svelte'
    import Table from './lib/Table.svelte'
    import Card from './lib/Card.svelte'
    import { UnauthorizedError } from './lib/errors';
 
    let data;
    let error;

    let user = {
        username: '',
        password: ''
    }

    interface CredentialObject {
        username: string;
        password: string;
    }

    function sleep(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }

    async function getData() {
        const res = await fetch('http://localhost:8080/api/v1/stats/');
        if (res.ok) {
            await sleep(3000);
            return await res.json();
        } else {
            throw new Error('There was a problem with your request');
        }
    }

    function handleClick () {
      data = getData();
    } 
    
    let authenticated: boolean = false;

    function prepareCredentials ({ username, password }: CredentialObject): string {
        return btoa(`${username}:${password}`);
    }


    async function onSubmit(e) {
        if (!user.username || !user.password) {
            error = 'please enter your username and password';
            return;
        }
       const auth = prepareCredentials(user);

       const response = await fetch('http://localhost:8080/api/v1/auth', {
            method: 'POST',
            headers: {
                'Authorization': `Basic ${auth}`,
            },
       });

        if (response.status === 401) {
            error = "Your username or password is wrong";
            return;
        }

        if (response.ok) {
            const { token } = await response.json();
            console.log(token);
            localStorage.user = JSON.stringify(user);
            localStorage.token = token;
            authenticated = true;
        }
        

        error = null;
    }

    function logout() {
        localStorage.removeItem("user");
        localStorage.removeItem("token");
        authenticated = false;
    }


    onMount(() => {
        if (localStorage.token) {
            authenticated = true;
        } 
    });
</script>

<main>
    {#if !authenticated}
        <Card>
            <form class="form" on:submit|preventDefault={onSubmit}>
                <div class='form input group'>
                    <label for="username">Username</label>
                    <input bind:value={user.username} id="username" name='username' type="text" />
                </div>
                <div class='form input group'>
                    <label for="password">Password</label>
                    <input bind:value={user.password} id="password" name='password' type="password" />
                </div>
                {#if error}
                    <p class="error">{error}</p>
                {/if}
                <button type="submit">Log in</button>
            </form>
        </Card>
    {:else}
        <div>
            <button on:click={logout}>Logout</button>
        </div>
      <div>
        <a href="https://vitejs.dev" target="_blank" rel="noreferrer">
          <img src={viteLogo} class="logo" alt="Vite Logo" />
        </a>
        <a href="https://svelte.dev" target="_blank" rel="noreferrer">
          <img src={svelteLogo} class="logo svelte" alt="Svelte Logo" />
        </a>
      </div>

      <button on:click={handleClick}>
        Get Data
      </button>

      {#await data}
        <p>...fetching</p>
      {:then data}
        {#if data}
            <p>Status</p>
            <p>{data.status}</p>
            <Table />
            <Table nofooter title="No Footer"/>
            <Table noheader title="No Header"/>
        {:else}
            <p>No data yet</p>
        {/if}
      {:catch errror}
        <p>{error.message}</p>
      {/await}
    {/if} 
</main>

<style>
  .logo {
    height: 6em;
    padding: 1.5em;
    will-change: filter;
    transition: filter 300ms;
  }
  .logo:hover {
    filter: drop-shadow(0 0 2em #646cffaa);
  }
  .logo.svelte:hover {
    filter: drop-shadow(0 0 2em #ff3e00aa);
  }
  .read-the-docs {
    color: #888;
  }
  
  .error {
    font-size: 0.75em;
    color: red;
  }
</style>